我比較喜歡聽音樂,特別是週末的時候,電腦開着百度隨心聽fm,隨機播放歌曲,躺在牀上享受。但碰到了一個煩人的事情,想切掉不喜歡的曲子,還得起牀去操做電腦換歌。因而思考能不能用手機控制電腦切換歌曲,通過一段事件的思考,絕對採用html5+socket.io來實現這個功能。首先我把該功能的實現拆分爲如下幾個步驟:javascript
下文中的代碼有不全的地方,你們能夠查看個人Github項目源碼https://github.com/zhu495472831/shake-music。php
html頁面編寫
仿造微信搖一搖的頁面,實現一個相似的界面,以下所示:
當咱們搖手機的時候,會作一個動畫,中間的圖案一分爲二,上半部向上運動而後回來,下半部亦同理,以下所示:
html代碼(shake.html):css
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no"> <title>搖一搖切歌</title> <link rel="stylesheet" href="shake.css"> </head> <body> <div class="wrap" id="wrap"> <div class="inner"></div> <div class="above-hand hand" id="up"></div> <div class="below-hand hand" id="bt"></div> </div> <div class="tip" id="tip"> </div> <div style="display: none;"> <audio id="shaking" src="new_silent.mp3"></audio> <audio id="found" src="new_silent.mp3"></audio> </div> <script type="text/javascript" src="socket.io.js"></script> <script src="shake.js"></script> </body> </html>
樣式表(shake.css):html
html,body{ width:100%; height:100%; background-color: #000; margin:0; overflow: hidden;} .wrap{ position: absolute; left:50%; top:50%; width:132px; height: 132px; -webkit-transform: translate(-50%,-50%); transform: translate(-50%,-50%); } .hand{ position: absolute; left:0; width:100%; height: 50%;background: url(shake.png) no-repeat #000; background-size: 132px 132px; } .above-hand{ top:0; background-position: 0 0; } .below-hand{ bottom:0; background-position: 0 -66px; } .inner{ position:absolute; top:50%; left:50%; width: 50px; height: 90px; background: url(inner.png) no-repeat 0 0;background-size: 50px 90px; -webkit-transform: translate(-50%,-50%); transform: translate(-50%,-50%); } .above-hand:after,.below-hand:before{ display: none; content:''; position:absolute; left:-100vw; width:200vw; height: 2px; background-color: #BABDC1; } .above-hand:after{ bottom:0; } .below-hand:before{ top:0; } .wrap.active .above-hand{ -webkit-animation: up 1.5s ease; animation: up 1s ease; } .wrap.active .below-hand{ -webkit-animation: down 1.5s ease; animation: down 1s ease; } .wrap.active .above-hand:after,.wrap.active .below-hand:before{ display: block; } .tip{ position: absolute; bottom: 30px; left: 10px; color: #fff; font-family: '楷體'; text-align: center; right: 10px; height: 32px; line-height: 32px; background-color: rgba(255,255,255,.4); border-radius: 3px; } .tip.active{ -webkit-animation: jump 1.5s linear; animation: jump 1s linear; } //動畫定義見github
腳本邏輯
接下來是移動端JS腳本邏輯的實現,搖一搖的實現需藉助html5新增的devicemotion事件,獲取設備在位置和方向上的改變速度的相關信息,該事件的基本使用以下:前端
if(window.DeviceMotionEvent){ window.addEventListener('devicemotion',handler,!1); }else{ alert('你的瀏覽器不支持搖一搖功能.'); }
devicemotion事件對象中有一個accelerationIncludingGravity屬性,該屬性包括:一個包含x、y 和z 屬性的對象,在考慮z 軸天然重力加速度的狀況下,告訴你在每一個方向上的加速度。該API的具體使用你們能夠參考網上的資料,很是多,這裏就不重複了。
搖一搖的具體邏輯以下:html5
function handler(e){ var current = e.accelerationIncludingGravity; var currentTime; var timeDifference; var deltaX = 0; var deltaY = 0; var deltaZ = 0; //記錄上一次設備在x,y,z方向上的加速度 if ((lastX === null) && (lastY === null) && (lastZ === null)) { lastX = current.x; lastY = current.y; lastZ = current.z; return; } //獲得兩次移動各個方向上的加速度絕對差距 deltaX = Math.abs(lastX - current.x); deltaY = Math.abs(lastY - current.y); deltaZ = Math.abs(lastZ - current.z); //當差距大於設定的閥值而且時間間隔大於指定閥值時,觸發搖一搖邏輯 if (((deltaX > threshold) && (deltaY > threshold)) || ((deltaX > threshold) && (deltaZ > threshold)) || ((deltaY > threshold) && (deltaZ > threshold))) { currentTime = new Date(); timeDifference = currentTime.getTime() - lastTime.getTime(); if (timeDifference > timeout) { dealShake(); lastTime = new Date(); } } lastX = current.x; lastY = current.y; lastZ = current.z; }
因爲搖一搖須要播放搖一搖的聲音以及切換歌曲成功後的聲音,但因爲手機大部分是禁止音頻的自動播放,必須須要用戶真實點擊才能播放音頻。這裏沒有完全的解決辦法,只是換了一個思路,利用用戶隨時觸摸屏幕的習慣,對document進行touchstart事件監聽。當用戶觸摸到屏幕時,先播放一個1S的無聲音頻,接着將touchstart事件移除,而後搖一搖的時候切換聲音源,播放搖一搖的聲音,這樣即可以達到相似的目的。代碼以下所示:java
document.addEventListener('touchstart',autoplay,!1); function autoplay(){ shaking.play(); found.play(); document.removeEventListener('touchstart',autoplay); }
html文檔
PC端界面也是仿的網上的一個html5音樂播放器的界面,效果以下所示:
HTML(shake_pc.html)佈局代碼以下:android
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>隨心聽</title> <meta name="referrer" content="never"> <link rel="stylesheet" href="reset2.0.css"> <link rel="stylesheet" href="shake_pc.css"> </head> <body> <!-- 控制背景圖效果 --> <div class="bg" id="bg"> </div> <div class="music-player"> <!-- 歌曲信息 --> <div class="info"> <div class="song-name" id="songName"></div> <div class="author" id="author">By <span></span></div> <!-- 播放進度 --> <div class="progress" id="progress"></div> </div> <!-- 歌曲控制 --> <div class="controls"> <div class="time" id="time">00:00</div> <div class="play-controls"> <a href="javascript:;" class="prev btn" id="prev"> </a><a href="javascript:;" class="play btn" id="play"> </a><a href="javascript:;" class="next btn" id="next"></a> </div> <div class="volume-bar"> <a href="javascript:;" class="vol-muted" id="muted"> </a><a href="javascript:;" class="vol-slider" id="volSilder"> <span class="vol-slider-inner" id="volInner"></span> </a><a href="javascript:;" class="vol-max" id="volMax"></a> </div> </div> <!-- 歌曲播放 --> <audio id="audio" controls style="display: none;"></audio> </div> <script type="text/javascript" src="socket.io.js"></script> <script type="text/javascript" src="shake_pc.js"></script> </body> </html>
css樣式
樣式佈局很是的簡單,沒什麼好講的。CSS樣式代碼(shake_pc.css)以下:git
body{ font-family: 'Open Sans', sans-serif; overflow: hidden; } .bg{ position: absolute; left:0; right: 0;top:0; bottom: 0;margin:-30px; filter: blur(30px); -webkit-filter: blur(30px); background: url(./imgaes/bg.jpg) no-repeat; background-size: cover;} .music-player{ position: relative; width: 350px; height: 290px; margin: 150px auto; box-shadow: 0 0 60px rgba(0, 0, 0, 0.8); border-radius: 7px; background: #222; overflow: hidden; z-index: 0; } .info{ position: relative; width: 100%; height: 80px; padding-top: 20px; color:#585858; text-align: center; } .info .song-name{ height: 30px; font-size: 30px; font-weight: 300; } .info .author{ margin-top: 14px; font-size: 14px; } .progress{ position: absolute; left:0; bottom:0; width: 0; height: 3px; background-color: #ed553b; } .controls{ height: 190px; background-color:rgba(152, 46, 75, 0.6); text-align: center; } .controls .time{ font-size:48px; height: 84px; line-height: 84px; color:rgba(225, 225, 225, 0.4); } .play-controls .btn{ display: inline-block; width:95px; height: 40px; vertical-align: top; } .play-controls .btn.prev{ background:url(./imgaes/prev.png) no-repeat center center; } .play-controls .btn.play{ background:url(./imgaes/play.png) no-repeat center center; } .play-controls .btn.next{ background:url(./imgaes/next.png) no-repeat center center; } .volume-bar{ position: relative; width:250px; height: 2px; margin: 30px auto 0; } .volume-bar .vol-muted{ position:absolute; left:0; top:-6px; width: 10px; height:13px;background:url(./imgaes/muted.png) no-repeat center center; } .volume-bar .vol-slider{ position: absolute; left:14px; right:28px; top:0; height:100%; background-color:rgba(255,255,255,.3); } .volume-bar .vol-slider-inner{ display: block; width:50%; height: 100%; background-color:#ed553b; } .volume-bar .vol-max{ position:absolute; right:0; top:-8.5px; width: 22px; height: 18px; background: url(./imgaes/max.png) no-repeat center center;}
腳本邏輯
文檔加載完成後,隨機獲取一首音樂,而後播放。點擊上一曲或下一曲都是隨機切換歌曲,以及能夠對音量進行控制,有興趣的朋友還能夠自行實現歌詞的同步播放。有關html5媒體原生API,你們能夠參考HTML5的Video標籤的屬性,方法和事件彙總
部分代碼以下:github
var mediaEvts = ['loadedmetadata','ended','timeupdate','error']; //隨機獲取一首音樂 function getSong(){ return new Promise(function(resolve,reject){ var xhr = new XMLHttpRequest(); xhr.onreadystatechange = function() { if (xhr.readyState === 4) { if (xhr.status === 200) { resolve(xhr.responseText); }else{ reject('發生錯誤'); } } }; xhr.open('get', 'http://api.jirengu.com/fm/getSong.php?channel=1', !0); xhr.send(); }); } function dealSong(responseText){ var songObj = JSON.parse(responseText), song = songObj.song[0]; updateUI(song); setMedia(song); return song; } function setMedia(song){ var songSrc = song.url, lrc = song.lrc; player.src = songSrc; player.volume = 0.5; player.play(); } function updateUI(song){ var name = song.title, artist = song.artist, img = song.picture; songName.innerText = name; author.querySelector('span').innerText = artist; bg.style.backgroundImage = 'url('+img+')'; } //初始化audio元素事件監聽 function initMediaEvents(player){ mediaEvts.forEach(function(evt,idx,arr){ var cb = evt+'CB'; player.addEventListener(evt,window[cb],!1); }); }
使用express+socket.io實現長鏈接,socket.io能夠利用npm進行安裝。根據UA實現PC+移動端渲染不一樣的頁面,將移動端的發送的命令廣播給PC端,而後達到移動端控制PC的效果,代碼以下所示:
const http = require('http'); var express = require('express'); var app = express(); var server = require('http').Server(app); var io = require('socket.io')(server); app.use(express.static('./')); app.get('/',(req,res)=>{ var userAgent = req.headers['user-agent'].toLowerCase(); if(/(android|iphone|mobile)/.test(userAgent)){ res.sendFile(__dirname+'/shake_m.html'); }else{ res.sendFile(__dirname+'/shake_pc.html'); } }); io.on('connection',function(socket){ var usrname = '', sendData = {}; console.log('a client connect...'+socket.id); socket.on('disconnect',function(){ console.log(`設備${socket.id}斷開鏈接.`); }); socket.on('message',function(data){ var cmd = data.cmd; //next命令是由移動端發送,OK命令是由PC切歌成功後發送的命令 if(cmd == 'next'){ socket.broadcast.emit('next'); }else if(cmd == 'ok'){ socket.broadcast.emit('ok',data.data); } }); }); server.listen(3000,function(){ console.log('start listening on 3000 port...'); });
首先在頁面中引入socket.io.js,而後鏈接socket服務器,接着監聽事件便可,以下所示:
//移動端socket邏輯 socket.on('connect',function(){ console.log('websocket鏈接已創建...'); }); socket.on('ok',function(data){ if(found.src!=host+'found.mp3'){ found.src = 'found.mp3'; } found.play(); tip.innerText = '正在欣賞:'+data.artist+'--'+data.title; tip.classList.remove('active'); tip.offsetWidth = tip.offsetWidth; tip.classList.add('active'); }); function dealShake(){ if(isShaking) return; isShaking = !0; if(shaking.src!=host+'shaking.mp3'){ shaking.src = 'shaking.mp3'; } shaking.play(); wrap.classList.add('active'); setTimeout(function(){ socket.emit('message',{cmd:'next',data:null}); },1000); } //PC端socket邏輯 function initIOEvts(){ socket.on('connect',function(){ console.log('websocket鏈接已創建...'); }); socket.on('next',function(data){ getSong().then(function(val){ var song = dealSong(val); socket.emit('message',{cmd:'ok',data:song}); },function(err){ console.log(err); }); }); }
當用戶搖動設備觸發搖一搖時,發送一個next命令的消息給服務端,而後服務端將該消息轉發給PC端,PC端接收到該消息後,執行歌曲切換操做,並反饋一個ok命令消息並攜帶歌曲消息給服務端,服務端再將該消息轉發回移動端,移動端播放切歌成功的聲音並顯示當前PC播放的歌曲。
這個功能主要是我本身使用,可能有些細節沒有進行處理,你們能夠在該基礎上進行改造,還能夠作一些多屏互動的效果。